Lectrosonics H187 Instruction Manual
Vhf narrowband plug-on transmitter
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Also See for H187:
- Operating instructions and troubleshooting manual (10 pages) ,
- Quick start manual (8 pages)
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Summary of Contents for Lectrosonics H187
- Page 1 INSTRUCTION MANUAL H187 VHF Narrowband Plug-On Transmitter • Crystal Controlled Fixed Frequency • Wide Range Input Limiting • Floating, Auto Latching Input Coupler • Machined Aluminum Construction Fill in for your records: Serial Number: Purchase Date: Rio Rancho, NM, USA...
- Page 2 H187 The H187 transmitter is FCC type accepted under Part 90 (150-172 MHz), and Part 74 (174-216 MHz) LECTROSONICS, INC.
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Page 3: Table Of Contents
Plug-On Transmitter Table of Contents Introduction ......................................3 General Technical Description ................................3 H187 Block Diagram ..................................... 3 Controls and Functions ..................................4 Input Jack ......................................4 Power/Mute Switch ....................................4 Power On/Off LED ....................................4 Modulation LEDs ....................................4 Level LED ...................................... -
Page 4: Introduction
The compandor in the 187 series transmitters is much ter (see block diagram below). tighter than the 185 series. The H187 compandor will The mic preamp is an ultra-low noise type op-amp. hold the transmitter deviation to no more than ±15kHz Aside from gain control, this stage also adds high under all circumstances. -
Page 5: Controls And Functions
Plug-On Transmitter Controls and Functions The POWER LED is connected to a precision battery The H187 may be used with a wide variety of micro- test circuit that continuously monitors battery voltage. phones. The 3-pin XLR type connector on the H187 The LED is at full brightness with a new 9 Volt alkaline. -
Page 6: Operating Instructions
If the mic level is too high — the LIMIT LED will light 1) Insert the H187 into the selected microphone. frequently or stay on. This condition may cause distor- Listen for the “click” that indicates the H187 has tion. locked on to the microphone. Pull on the mic to insure proper locking has occurred. -
Page 7: Battery Replacement
Plug-On Transmitter Battery Replacement drawing. Only slight, sliding pressure is needed to open The H187 transmitter is powered by a standard alkaline and close the battery door. 9 Volt battery. It is important that you use ONLY an ALKALINE battery for longest life. Standard zinc- Swing the door open and take note of the polarity carbon batteries marked “heavy duty”... -
Page 8: Troubleshooting
H187 Troubleshooting Before going through the following chart, be sure that you have a good battery in the transmitter - the red power LED on the transmitter panel should glow brightly. Symptom Possible Cause Transmitter Battery LED Off 1) Battery is inserted backwards. -
Page 9: Service And Repair
There are no adjustments inside that will make a malfunctioning unit start working. LECTROSONICS’ Service Department is equipped and staffed to quickly repair your equipment. In warranty repairs are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a modest flat rate plus parts and shipping. -
Page 10: Limited One Year Warranty
This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot correct the defect in your equipment, it will be replaced at no charge with a similar new item.
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